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again and again until acknowledgment is received.
QoS 2: exactly once. The MQTT protocol uses the confirmation of confirmations to ensure that a
message is delivered exactly once.
By setting the Retain flag the MQTT Broker is instructed to save the most recent data value for the
topic. Data values without Retain flag are only transferred from the MQTT Broker to those MQTT
Subscribers that are registered at the broker and have subscribed to the appropriate topic in the
moment when sending the data to the broker.
Used to reply for IO status to server
Fig. 24 Topic to subscribe
Table 13 Subscribe message setting
The data printed to the serial port can be set whether to carry the Topic
Used to Query IO status from server
3.1.6. Edge computing
The M100 gateway supports southbound fieldbus protocols of Modbus RTU protocols. It also supports northbound MQTT/ Cloud
protocols of MQTT Broker, TCP/UDP/HTTP in socket, AWS IOT, and Alibaba Cloud IoT Platform. The M100 gateway fulfills a different
role on each of its sides. Each role is determined by your devices' settings. Therefore, set the role of each of your devices correctly.
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